摘要
精确确定辐照孔道内样品中子注量率分布是开展辐照实验设计的基础,本文对HFETR辐照孔道中子注量率分布的重要影响因素进行了敏感性分析。结果表明,辐照孔道之间的影响随着孔道间距离的增大而减小,距离最近的孔道影响可达8%;考虑所有燃耗步求得的样品中子注量比只考虑中间燃耗步的更精确,两者偏差随着辐照注量的增加而减小,最大偏差达6%;孔道周围燃料元件轴向燃耗均匀分布与近似余弦分布时的样品中子注量率偏差达4%,后者计算精度提高约45%;考虑计算效率和计算精度,计数栅元高度取1.5~2.5 cm较为合适。
Determining the samples’neutron flux distribution precisely in the irradiation channel is the base of irradiation experiment design.The sensitivity of some important factors affecting irradiation channels’neutron flux in the High Flux Engineering Test Reactor(HFETR)is analyzed in the paper.The results of calculation and analysis show that the extent of the influence among the irradiation channels decreases with the channels’distance increasing,the influence of the nearest channel can reach 8%.The samples’neutron flux considering all burnup steps is more accurate than that of the middle burnup step,the deviation decreases as the irradiation flux increases,the maximum deviation is about 6%.The fast neutron fluxes are calculated respectively,considering axial burnup of the fuel elements around the irradiation channel are uniform distribution and cosine distribution,the deviation is about 4%,the calculation accuracy has been improved about 45%.Setting the height of the tally cells as 1.5~2.5 cm is available,considering the calculation efficiency and accuracy.
作者
刘红倩
刘水清
康长虎
屈英前
LIU Hongqian;LIU Shuiqing;KANG Changhu;QU Yingqian(The Nuclear Power Institute of China,Chengdu of Sichuan Prov.610213,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2021年第6期1130-1137,共8页
Nuclear Science and Engineering
